c4,TSV holds 10% of Warro.The company you mentioned holds 83.3% of that project.(SP 15c)Thats 8 times the holding.Simple arithmatic 8 X TSV Sp 2.3c= 18.4c..pretty close to 15c.
DUR Duratec snags $76.5M in works from Woodside and Defence respectively - including spy network upgrade